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Valve Selection

Cameron Huntley - Monday, January 31, 2011
Industrial Valve Selection

Valve selection for your fluid handling system depends on several application factors.  First, you need to specify how you need to control the system.  You must determine whether  you need an on/off, modulating, pressure relief/regulator, or backflow prevention valve.  You may also choose to manually operate the valve or leave the control to automation.  Electric and pneumatic actuation may be required for remote operation.

The chemical resistance of thermoplastic valves should be carefully selected for the best performance in your particular application.  For example: 98% sulfuric acid would not be recommended for use in a PVC valve.  The better option would be PVDF in this high concentration.  Lower concentrations of sulfuric acid would be suitable for PVC. 

There are a variety of elastomers to choose from with varying  chemical resistance and temperature ratings.  PTFE, EPDM, FKM, TFE, Viton, and nitrile are a few of the choices that are offered.  For example: a sodium hydroxide application would require EPDM elastomer, whereas Viton would not be compatible.

With the vast selection of thermoplastics available, finding the one that matches your chemical resistance and temperature range needs is very important.  PVC is normally used in temperature ranges up to 140 degrees F.  Polypropylene and PVDF can be used with temperatures ranging from 195 to 250 degrees F.  Each manufacturer has information specific to their products' compatibility for your specific application.  Please feel free to contact one of our W. P. Law Inc. Industrial representatives with your valve selection questions.

- Karen Smith
  W.P. Law Inc.
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